A failure in the middle of the build may be caused by build parallelism (enabled by default).

[anajera05]

[punchagan]

@anajera05 Can you give more context on the error? What package was this building? If there's a link to the logs, that would be helpful too.

[mbarbin]

I just encountered a similar error. This is for the windows-latest, 4.08.x job of pp's CI in PR 21. See for example this run.

[mbarbin]

If this helps, I found trace of this error message in packages/ocaml-base-compiler/ocaml-base-compiler.4.08.1/opam's post-messages, in this repository.

[mbarbin]

With the help of ocaml/setup-ocaml#861 I understand it is not always simple to anticipate which architecture is going to be used when choosing an OS by name on GitHub workflow actions.

It seems there are going to be instances where this message is not that helpful in that it may take the attention away from what may be an actual build incompatibility, which does not relate to build parallelism. For example, in the log I linked, I now see:

   # C:/mingw64/x86_64-w64-mingw32/include/_mingw.h:271:2: error: #error Only Win32 target is supported!
  #   271 | #error Only Win32 target is supported!
  #       |  ^~~~~

[RichAyotte]

I'm seeing the same issue.

❯ echo $MAKEFLAGS
-j16

❯ echo $CFLAGS
-O2 -pipe -march=native -flto -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing

❯ echo $CXXFLAGS
-O2 -pipe -march=native -flto -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing

[RichAyotte]

Continues to fail with --jobs=1 suggestion but with different error.

<><> Installing new switch packages <><><><><><><><><><><><><><><><><><><><><><>
Switch invariant: ["ocaml-base-compiler" {= "4.14.2"}]

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
⬇ retrieved ocaml-config.2  (cached)
∗ installed base-bigarray.base
∗ installed base-threads.base
∗ installed base-unix.base
∗ installed host-arch-x86_64.1
∗ installed host-system-other.1
∗ installed ocaml-options-vanilla.1
⬇ retrieved ocaml-base-compiler.4.14.2  (cached)
[ERROR] The compilation of ocaml-base-compiler.4.14.2 failed at "make -j1".

#=== ERROR while compiling ocaml-base-compiler.4.14.2 =========================#
# context     2.2.1 | linux/x86_64 |  | git+https://github.com/ocaml/opam-repository.git#0f4d0ee5b69b496a4e26f305891c31400f0b4b5f
# path        ~/Projects/tezos/tezos/_opam/.opam-switch/build/ocaml-base-compiler.4.14.2
# command     ~/.opam/opam-init/hooks/sandbox.sh build make -j1
# exit-code   2
# env-file    ~/.opam/log/ocaml-base-compiler-557611-153e30.env
# output-file ~/.opam/log/ocaml-base-compiler-557611-153e30.out
### output ###
# [...]
# floats.c:440:16: note: type ‘value’ should match type ‘void’
# floats.c:440:16: note: ‘caml_abs_float’ was previously declared here
# lto1: some warnings being treated as errors
# lto-wrapper: fatal error: gcc returned 1 exit status
# compilation terminated.
# /usr/bin/ld: error: lto-wrapper failed
# collect2: error: ld returned 1 exit status
# make[2]: *** [Makefile:272: ocamlrun] Error 1
# make[2]: Leaving directory '/home/rich/Projects/tezos/tezos/_opam/.opam-switch/build/ocaml-base-compiler.4.14.2/runtime'
# make[1]: *** [Makefile:165: coldstart] Error 2
# make[1]: Leaving directory '/home/rich/Projects/tezos/tezos/_opam/.opam-switch/build/ocaml-base-compiler.4.14.2'
# make: *** [Makefile:313: world.opt] Error 2

❯ gcc --version
gcc (Debian 14.2.0-5) 14.2.0
Copyright (C) 2024 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.